Use of uninitialized value in concatenation (.) or string at makefile.pl line 93

I find:

92: $uno_lib = $ENV{'OO_SDK_URE_LIB_DIR'};
93: $uno_libpath = "-L$uno_lib";
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which suggests to me that $ENV{'OO_SDK_URE_LIB_DIR'} has not been set. In addition to what Corion has already suggested, you probably also need to attend to this.

Cheers,
Rob